[media] V4L: soc-camera: start stream after queueing the buffers
Some camera systems have strong requirement for capturing
an exact number of frames after starting the stream and do
not tolerate losing captured frames. By starting the stream
after the videobuf has queued the buffers, we ensure that
no frame will be lost.
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/soc_camera.c b/drivers/media/video/soc_camera.c
index a7820a5..67611ad 100644
--- a/drivers/media/video/soc_camera.c
+++ b/drivers/media/video/soc_camera.c
@@ -655,10 +655,10 @@
if (icd->streamer != file)
return -EBUSY;
- v4l2_subdev_call(sd, video, s_stream, 1);
-
/* This calls buf_queue from host driver's videobuf_queue_ops */
ret = videobuf_streamon(&icd->vb_vidq);
+ if (!ret)
+ v4l2_subdev_call(sd, video, s_stream, 1);
return ret;
}